This is very unfortunate 
and how it stands you probably can’t do much 
The following won’t help you retrieve the tokens but just want to mention that using and software wallet has a greater risk of being successfully attacked than a hardware wallet, cold storage, paper keys. For holding larger amounts of ADA I strongly suggest not to use a software wallet.
Reason: Software wallets store the private keys encrypted on the device (computer, phone). When needed those keys are decrypted using the spending password. There are multiple attack vectors against software wallets:
- Computer infected with malware that acts as a key logger or clipboard hijacker and so capturing the spending password
- Malware that does a brute force dictionary attack on the encrypted file. It may take hours, days or months to unlock the file, but thieves are not in a hurry
- Malware that hijacks the clipboard so when pasting the recipients address it pastes the hacker’s address (check the address multiple times before doing a transaction)
- Infected computer might show the expected address in the wallet while actually sending to hacker’s address
- I guess there are many more attack options…
Using a hardware wallet those keys are kept on a hardware device so it’s much harder to get to them, even if the computer is infected. Replacing the recipient address can be discovered on hardware wallet as it displays it on the display before confirming the transaction (always verify address before confirmations)
Using cold storage (air gapped machine) for keys would require CLI skills but if just holding and staking you could delegate once and forget about it for some time.
So to sum up, I’d keep small amounts of ADA on a software wallet for “day to day” use, as there is greater possibility of theft. For the other, significant amount of ADA, I’d use a hardware wallet or air gapped machine.